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Differentiate between error delay and connect/reconnect delay.

Browse source 
The difference is here to reject incoming connections in the
first case.
This commit is contained in:
Ondrej Zajicek 2009-06-06 18:16:22 +02:00
parent 2a04b045e4
commit dd91e46765
2 changed files with 57 additions and 36 deletions
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77
proto/bgp/bgp.c
View file

@ -73,8 +73,7 @@ static int bgp_counter; /* Number of protocol instances using the listening so
static void bgp_close(struct bgp_proto *p, int apply_md5);
static void bgp_connect(struct bgp_proto *p);
static void bgp_active(struct bgp_proto *p, int delay);
static void bgp_initiate(struct bgp_proto *p);
static void bgp_active(struct bgp_proto *p);
static void bgp_stop(struct bgp_proto *p);
static sock *bgp_setup_listen_sk(void);
@ -113,10 +112,36 @@ bgp_open(struct bgp_proto *p)
}
}
p->start_state = p->cf->capabilities ? BSS_CONNECT : BSS_CONNECT_NOCAP;
return 0;
}
static void
bgp_startup(struct bgp_proto *p)
{
BGP_TRACE(D_EVENTS, "Started");
p->start_state = p->cf->capabilities ? BSS_CONNECT : BSS_CONNECT_NOCAP;
bgp_active(p);
}
static void
bgp_startup_timeout(timer *t)
{
bgp_startup(t->data);
}
static void
bgp_initiate(struct bgp_proto *p)
{
if (p->startup_delay)
{
BGP_TRACE(D_EVENTS, "Startup delayed by %d seconds", p->startup_delay);
bgp_start_timer(p->startup_timer, p->startup_delay);
}
else
bgp_startup(p);
}
/**
* bgp_close - close a BGP instance
* @p: BGP instance
@ -293,7 +318,7 @@ bgp_decision(void *vp)
DBG("BGP: Decision start\n");
if ((p->p.proto_state == PS_START)
&& (p->outgoing_conn.state == BS_IDLE))
bgp_initiate(p);
bgp_active(p);
if ((p->p.proto_state == PS_STOP)
&& (p->outgoing_conn.state == BS_IDLE)
@ -473,8 +498,9 @@ bgp_setup_sk(struct bgp_proto *p, struct bgp_conn *conn, sock *s)
}
static void
bgp_active(struct bgp_proto *p, int delay)
bgp_active(struct bgp_proto *p)
{
int delay = MIN(1, p->cf->start_delay_time);
struct bgp_conn *conn = &p->outgoing_conn;
BGP_TRACE(D_EVENTS, "Connect delayed by %d seconds", delay);
@ -537,17 +563,6 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
bgp_start_timer(conn->connect_retry_timer, p->cf->connect_retry_time);
}
static void
bgp_initiate(struct bgp_proto *p)
{
unsigned delay = MAX(p->startup_delay, p->cf->start_delay_time);
if (delay)
bgp_active(p, delay);
else
bgp_connect(p);
}
/**
* bgp_incoming_connection - handle an incoming connection
* @sk: TCP socket
@ -564,7 +579,6 @@ static int
bgp_incoming_connection(sock *sk, int dummy UNUSED)
{
struct proto_config *pc;
int match = 0;
DBG("BGP: Incoming connection from %I port %d\n", sk->daddr, sk->dport);
WALK_LIST(pc, config->protos)
@ -573,15 +587,16 @@ bgp_incoming_connection(sock *sk, int dummy UNUSED)
struct bgp_proto *p = (struct bgp_proto *) pc->proto;
if (ipa_equal(p->cf->remote_ip, sk->daddr))
{
match = 1;
if ((p->p.proto_state == PS_START || p->p.proto_state == PS_UP) && (p->start_state > BSS_PREPARE))
{
BGP_TRACE(D_EVENTS, "Incoming connection from %I port %d", sk->daddr, sk->dport);
if (p->incoming_conn.sk)
{
DBG("BGP: But one incoming connection already exists, how is that possible?\n");
break;
}
/* We are in proper state and there is no other incoming connection */
int acc = (p->p.proto_state == PS_START || p->p.proto_state == PS_UP) &&
(p->start_state >= BSS_CONNECT) && (!p->incoming_conn.sk);
BGP_TRACE(D_EVENTS, "Incoming connection from %I (port %d) %s",
sk->daddr, sk->dport, acc ? "accepted" : "rejected");
if (!acc)
goto err;
bgp_setup_conn(p, &p->incoming_conn);
bgp_setup_sk(p, &p->incoming_conn, sk);
sk_set_ttl(sk, p->cf->multihop ? : 1);
@ -589,9 +604,9 @@ bgp_incoming_connection(sock *sk, int dummy UNUSED)
return 0;
}
}
}
if (!match)
log(L_AUTH "BGP: Unauthorized connect from %I port %d", sk->daddr, sk->dport);
log(L_WARN "BGP: Unexpected connect from unknown address %I (port %d)", sk->daddr, sk->dport);
err:
rfree(sk);
return 0;
}
@ -730,6 +745,10 @@ bgp_start(struct proto *P)
p->event->hook = bgp_decision;
p->event->data = p;
p->startup_timer = tm_new(p->p.pool);
p->startup_timer->hook = bgp_startup_timeout;
p->startup_timer->data = p;
/*
* Before attempting to create the connection, we need to lock the
* port, so that are sure we're the only instance attempting to talk

6
proto/bgp/bgp.h
View file

@ -82,6 +82,7 @@ struct bgp_proto {
ip_addr local_addr; /* Address of the local end of the link to next_hop */
ip_addr source_addr; /* Address used as advertised next hop, usually local_addr */
struct event *event; /* Event for respawning and shutting process */
struct timer *startup_timer; /* Timer used to delay protocol startup due to previous errors (startup_delay) */
struct bgp_bucket **bucket_hash; /* Hash table of attribute buckets */
unsigned int hash_size, hash_count, hash_limit;
struct fib prefix_fib; /* Prefixes to be sent */
@ -241,8 +242,9 @@ void bgp_log_error(struct bgp_proto *p, char *msg, unsigned code, unsigned subco
*/
#define BSS_PREPARE 0 /* Used before ordinary BGP started, i. e. waiting for lock */
#define BSS_CONNECT 1 /* Ordinary BGP connecting */
#define BSS_CONNECT_NOCAP 2 /* Legacy BGP connecting (without capabilities) */
#define BSS_DELAY 1 /* Startup delay due to previous errors */
#define BSS_CONNECT 2 /* Ordinary BGP connecting */
#define BSS_CONNECT_NOCAP 3 /* Legacy BGP connecting (without capabilities) */
/* Error classes */